Hello, thank you for your answer.
I checked “bandwidth error” with my hosting provider, and it looks like there is not a problem. There are many errors on my site which I will try to solve.
I made new page for testing https://www.bezkycertovica.sk/test , where I put only Mapster shortcode, and the map is loaded just after I open the console in browser. Any idea what it could be? I guess it is again something with the page.
Thank you, have a nice day,
Martin